chore: remove obsolete Android app configuration files

- Deleted build.gradle.kts, gradle.properties, and gradlew files as part of the cleanup process.
- Removed local.properties and various generated files from the .gradle directory to streamline the project structure.
- Cleared out unnecessary build artifacts and intermediate files to improve project maintainability.

backend/routes/billingRoutes.js

@@ -0,0 +1,38 @@
+import express from 'express';
+import { authenticate } from '../middleware/authMiddleware.js';
+import { authorize } from '../middleware/authorizationMiddleware.js';
+import {
+  uploadBillingTemplateMiddleware,
+  listTemplates,
+  createTemplate,
+  deleteTemplate,
+  updateTemplateFields,
+  createRun,
+  listRuns,
+  getRunDetails,
+  deleteRun,
+  getUserSettings,
+  calculateHoursPreview,
+  generateRun,
+  downloadTemplatePdf,
+  downloadRunPdf
+} from '../controllers/billingController.js';
+
+const router = express.Router();
+
+router.get('/templates/:clubId', authenticate, authorize('members', 'read'), listTemplates);
+router.post('/templates/:clubId', authenticate, authorize('members', 'write'), uploadBillingTemplateMiddleware, createTemplate);
+router.delete('/templates/:templateId', authenticate, deleteTemplate);
+router.put('/templates/:templateId/fields', authenticate, updateTemplateFields);
+router.get('/templates/:templateId/pdf', authenticate, downloadTemplatePdf);
+
+router.get('/runs/:clubId', authenticate, authorize('members', 'read'), listRuns);
+router.get('/run/:runId', authenticate, getRunDetails);
+router.get('/settings/:clubId', authenticate, authorize('members', 'read'), getUserSettings);
+router.get('/hours-preview/:clubId', authenticate, authorize('members', 'read'), calculateHoursPreview);
+router.post('/runs/:clubId', authenticate, authorize('members', 'write'), createRun);
+router.post('/runs/:runId/generate', authenticate, generateRun);
+router.get('/runs/:runId/download', authenticate, downloadRunPdf);
+router.delete('/runs/:runId', authenticate, deleteRun);
+
+export default router;